对音频进行短时傅里叶变化，维纳滤波后还原，可以滤去20db不相关噪声-Short time Fourier transform of the audio, after the reduction Wiener filter can filter out irrelevant noise 20db

利用各种不同的原理对音乐进行降噪，诸如傅里叶变换，低通滤波-Noise reduction is performed using a variety of different principles for music, such as a Fourier transform, the low-pass filtering, etc.

对声音信号进行butter低通滤波,对录入的信号进行傅里叶变换，同时对比滤波前后，声音信号的不同-Butter sound signal low-pass filtering, of the Fourier transform of input signals, while before and after filtering, different sound signal